\begin{table}[htbp]\centering \def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi} \caption{Coverage and population shares of QCEW samples \label{tab:coverage}} \begin{tabular*}{\hsize} {@{\hskip\tabcolsep\extracolsep\fill}l*{7}{c}} \toprule
            &\shortstack{Total units\\(counties/pairs)}&\shortstack{Units in sample\\(counties/pairs)}&\shortstack{Percentage of\\units in sample}&\shortstack{Percentage of\\population covered}\\
\midrule
Counties    &        3109&        1704&       54.81&       91.49\\
MSCZ pairs  &         151&          95&       62.91&       87.85\\
Border county pairs&        1165&         430&       36.91&       83.36\\
 \hline\hline \end{tabular*} {\centering \caption*{\begin{footnotesize} This table shows the coverage of QCEW data by number of units (pairs/counties) and populations. Row 1 shows the balanced QCEW sample sizes. Rows 2 and 3 show coverage for the complete pairs in the border county and MSCZ pairs regressions. The first column reports the total number of units/pairs in JNR's sample. Samples exclude Alaska, Hawaii, and DC. \end{footnotesize}}} \end{table} 
